Si3N4 Ceramic Silicon Nitride Full ball Ceramic Bearing 6900 to 6906

Item Description: Si3N4 Ceramic Silicon Nitride Full ball Ceramic Bearing 6900 to 6906 The main advantages of silicon nitride bearings are: 1. It is 59% lighter than the steel ball, greatly reducing the centrifugal force, crushing and wear of the channel when the bearing is running at high speed and accelerating. 2. The elastic modulus is 44% larger than that of steel, which means that the deformation is greatly reduced than that of steel ball when stressed; 3, the hardness is higher than steel, Rc reached 78; 4, small friction coefficient; 5, the coefficient of thermal expansion is 1/4 of steel, can withstand temperature upheaval; 6, easy to obtain almost perfect surface finish, Ra can reach 4 ~ 6 nm; 7, high temperature resistance: silicon nitride ceramic ball at 1050°C high temperature still has high strength, hardness; 8, never rust, can work in oil-free lubrication conditions; 9, more resistant to chemical corrosion than steel; 10, no metal pollution; 11, no magnetic; 12. Electrical insulation. 13, there is no adhesion wear; Shipping: 1.Item will be shipped by airmail within 48 hours after full payment is received. 2.We only ship to the confirmed address provided by PayPal. Before you pay, please make sure your address in PayPal matches the address you would like us to ship to. Any non-received items caused by invalid address registered on PayPal are not in our full refund or replacement policy. 3 .All items will be shipped within 48 business hours upon receipt of payment 4 .A notification email of dispatch will be sent to buyer after item is posted. Please email us if you don’t receive our email after 3 days of full payment sent. 5 .Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyer’s responsibility Countries Delivery Time Working Days (not including holiday) 5-8 9-12 13-16 17-19 20-22 Working Days Saturday+Sunday 5-9 10-14 15-20 21-25 26-30 United States Rate(item arrived) 9.00% 50.00% 21.00% 12.90% 7.00% United Kingdom Rate(item arrived) 10.00% 62.00% 20.00% 3.00% 4.50% Australia Rate(item arrived) 23.00% 50.00% 13.00% 8.00% 5.90% France Rate(item arrived) 1.50% 20.50% 45.00% 22.70% 10.00% Germany Rate(item arrived) 5.50% 25.00% 35.00% 18.90% 15.50% Canada Rate(item arrived) 0.00% 44.00% 35.00% 17.90% 3.00% Spain Rate(item arrived) 1.50% 25.00% 50.00% 14.00% 9.50% Brazil,Russia,Italy Rate(item arrived) 0.00% 10.00% 20.50% 48.00% 12.00% Feedback: we’ll doing our best to ensure item quality and our service. so if you have any problem,please do feel free to contact with us before leaving feedback. we’ll try our best to slove you problem,and improve our service. Return Description: In the unlikely event that a return is request, all returns must include all original items undamaged, in re-saleable condition, all original packaging including manuals, warranty forms, etc. Shipping and handling fees are not refundable. Buyer is responsible for shipping costs incurred shipping products back. Buyers’ Information: We strive our best to provide you the most reliable, affordable way of shipping service. But sometimes international delivery is highly depended on the courier company and local customs/duties. If you do not receive your item on time, please contact us immediately for further assistance. Thank you for your understanding.